Puzzle lock



Nov. 13, 1934. L. ZEUMER, GEB. KLEIBR 1,980,513

A PUZZLE Locx Filed Oct. 2, 1930 E? fr Patented Nov. 13, 1934 PATENTOFFICE vPUZZLE Loony Luise Zeumer, geb. Kleiber, Karlsruhe in Baden,Germany, .assignor to Eugene Leuner, Zurich,

Switzerland Application OctoberA 2,

1930, Vserial No. 485,883

In Germany October 14, 1929 3 Claims.

This invention relates to a puzzle lock (keyless safety lock) with twotumblers rotatable around a common axle and adjustable 1by a shiftableturning knob, which lock differs from the known -5 locks of this typethrough the great simplicity of yits construction and the facility ofproduction in that it has only a single spring and, besides this spring,the turning knob and a few pins, comprises only stamped and partlypressed sheet l metal parts.

The lock is illustrated by way of example in the accompanying drawing inwhich:- Fig. 1 is a longitudinal section on the broken line I-I of Fig.2.

Fig. 2 is a top plan View with the cover removed, the lock being in openposition.

Fig. 3 is a similar view to Fig. 2, the lock being however in lockingposition.

On the bottom plate of the lock casing 1 a plate 20. 2 of substantiallyrectangular shape and shiftable in longitudinal direction is arranged,which carries a latch 3 and a projection 4 and has an elongated hole 5and two longitudinal slots 6 KFig. 2). The projection 4 and theelongated fhole 5 are situated in the longitudinal axis of the lock, theslots 6 being symmetrical and parallel "thereto, Two circular tumblerdiscs 7 lie on the plate 2, as also a somewhat smaller intermediate disc8 and two hook-shaped levers 9, these parts .30.. -lying loosely on oneanother. The discs 7 have a large circular hole 10 in the centre (Figs.1 and f2), the disc 8 has a somewhat smaller circular hole 11 and fournotches on its circumference. Each of the discs 7 has further a radialrectangu- 35. lar slot 12, which in the position shown in Figs. l and 2registers with a similar slot 13 in the disc 8 which lies opposite tothe projection 4 of the plate 2, and on the outer edge an upwardly pro-',jecting lug 14 (Figs. 2 and 3) at the side of which ,40 the free endof the lower or upper lever 9 projects. The bottom plate of the casing 1has four pins l5 which, like the notches of the disc 8, are arranged atthe corners of a square, the centre point of which lies in thelongitudinal axis of the lock and coincides with that of the discs 7 and8, 'and which project through the slots 6 and close against the inneredge of the discs 7 through holes 10 therein and the notches in the disc8 so that they secure the latter against shifting and 50,. turning andthe discs 7 only against shifting. One of the two left hand pins 15constitutes the pivot of the lower lever 9 and the other left hand pin15 for the upper lever 9, as it projects through a hole in the lever upto the upper side thereof,

K,whereas the two right hand pins 15 project only up to the plane oftheupper surface of the upper disc 7.

On the cover plate16 ofthe casing 1 the turning knob 17,y shiftable inlongitudinal direction, is arranged, which has a collar 18 lying in anelongated hole in the cover plate and carries a pin 19 engaging in theelongated hole 5 in the plate 2; A circular disc 20 having a radial arm21 (Figs. 2 and 3) is mounted on the pin 19 directly above the upperlever 9, and between this disc and the cover plate 16 a loose squareplate 23 is arranged and which is secured against rotation by twoprojections 22 (Fig. 2) on the under side of the cover plate and havinga downwardly projecting lug 24. The bottom plate of the casing l hasalso two pins 25 and 26 projecting through slots in the plate 2. A coilspring 27 is mounted on the pin 25 having two long arms' lyingtransversely over the plate 2, the lower of said arms bearing againstthe latch 3 and the upper on the lug 24 and with its free end on the pin26, so that this spring tends to hold the plate 2 with the latch 3 andthe projection 4 in the extended position shown in Figs. 1 to 3, and theplate 23 and the parts 17, 18, 19 and 20 in the position shown in Figs.1 and 2, in which positions the plate 2 abuts against the pin 25 and thepin 19 against the right hand end of the elongated hole 5.

When the tumbler discs 7 are in the position shown in Figs. 1 and 2, theknob 17 and therewith also the plate 2 together with the latch 3 throughthe pin 19 can be pulled back into the position shown in dot dash linesin Figs. 1 and 2, in that the projection 4 can enter into theregistering slots 12 and 13 of the discs 7 and 8 situated oppositethereto. In order tosecure the plate 2 with the latch 3 in extendedposition,

the knob 17 is first turned with the disc 20 so v that its arm 21 comesopposite the lug 24 of the plate 23, which position is indicated bymarks on the foot of the knob and on a scale arranged on the cover plate16. The knob 17 together with the parts 18, 19, 20 and 23 is then pushedto the left, against the action of the spring 27, until the pin 19 abutsagainst the left hand end oi" the elongated hole 5 (see Fig. 3). Thusthis pin forces apart the crossed inner ends of the levers 9 situated infront of it, so that these levers turn and, owing to their outer endsbearing against the lugs 14 of the discs 7, these discs are also rotatedfrom the position shown in Figs. 1 and 2 into that shown in Fig. 3, inwhich the projection 4 of the plate 2, instead of lying opposite theslots 12, is opposite a portion of the outer edgesr of the. discs 7, sothat the return movement of the plate 2 towards the right is preventedby the projection 4 abutting against the edges of the discs.

In order to release the lock, the knob 1'7 pushed back in the solid lineintermediate position shown in Figs. 1 and 2, is turned together Withthe disc rst in one and then in the other direction until the markapplied on the foot of the knob coincides with a certain division lineon the scale tted on the cover plate 16. The tumbler .discs '7 and thelevers 9 are thus also turned back into the position shown in Figs. 1and 2 in thatjthe disc 20, by means of its arm 21 bearing against thelugs 14, shifts the discs 7, which in turn shift the levers 9 throughthe intermediary of said lug thus bringing the projection 4 voppositethe carrying said rotatable shifting knob, two tumbler discs rotatableabout said pin, pinsvforming a hubv about which said tumblers rotate,two

hook-shaped levers pivotally mounted on said jshaped levers.

said casing into its locking position. 5

LUISE ZEUMER, GEB. KLEIBER.

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